Successful catheter ablation using real-time ultrasound-assisted 3-D electroanatomical mapping system for atrioventricular accessory pathway in a 1-year-old girl with criss-cross heart - Shigeo Watanabe, MD; Yoko Yoshida, MD; Tsugutoshi Suzuki, MD, PhD; Yoshihide Nakamura, MD (HeartRhythm Case Reports, 2016)